GroupCollection Class、Regex.GetGroupNumbers()、Regex.GetGroupNames()

 

GroupCollection Class 有三個值得注意的屬性

 

一、Count

在一輪的比對中，用來取得分群的數量

using System;
using System.Text.RegularExpressions;

public class Example
{
    public static void Main()
    {
        string input = "abc-bob add-but ";
        string pattern = @"(a\w+)-(b\w+)\s";

        Match match = Regex.Match(input, pattern);
        while (match.Success)
        {
            for (int groupsCount = 0; groupsCount < match.Groups.Count; groupsCount++)
            {
                Console.WriteLine(match.Groups[groupsCount].Value);
            }
            match = match.NextMatch();
        }
    }
}

其結果為

說明：

上例中 GroupCollection.Count 為 3，表示第一輪的比對，

其分群有兩個(第一個為整個群組的值，不把他算在內)，

分別為 abc 與 bob。

 

二、GroupCollection[Int32]

用來取得第 n 個分群的 Group 物件

using System;
using System.Text.RegularExpressions;

public class Example
{
    public static void Main()
    {
        string input = "abc-bob add-but ";
        string pattern = @"(a\w+)-(b\w+)\s";

        Match match = Regex.Match(input, pattern);
        while (match.Success)
        {
            for (int groupsCount = 0; groupsCount < match.Groups.Count; groupsCount++)
            {
                Group g = match.Groups[groupsCount];
                Console.WriteLine(g.Value);
            }
            match = match.NextMatch();
        }
    }
}

其結果為

 

三、GroupCollection[String]

用來取得某命名分群的 Group 物件

using System;
using System.Text.RegularExpressions;

public class Example
{
    public static void Main()
    {
        string input = "abc-bob add-but ";
        string pattern = @"(?<myA>a\w+)-(?<myB>b\w+)\s";

        Match match = Regex.Match(input, pattern);
        while (match.Success)
        {
            Group ga = match.Groups["myA"];
            Console.WriteLine("myA = " + ga.Value);

            Group gb = match.Groups["myB"];
            Console.WriteLine("myB = " + gb.Value);

            match = match.NextMatch();
        }
    }
}

其結果為

 

四、Regex.GetGroupNumbers Method

用來取得分群的 index(第一個表示為一整個群組，不把他算在內)

using System;
using System.Text.RegularExpressions;

public class Example
{
    public static void Main()
    {
        string input = "abc-bob add-but ";
        string pattern = @"(a\w+)-(b\w+)\s";

        Regex rgx = new Regex(pattern);
        int[] groupNumbers = rgx.GetGroupNumbers();

        for (int i = 0; i < groupNumbers.Length; i++)
        {
            Console.WriteLine(groupNumbers[i]);
        }
    }
}

其結果為

 

五、Regex.GetGroupNames Method

用來取得分群的名稱(第一個表示為一整個群組，不把他算在內)

using System;
using System.Text.RegularExpressions;

public class Example
{
    public static void Main()
    {
        string input = "abc-bob add-but ";
        string pattern = @"(?<myA>a\w+)-(?<myB>b\w+)\s";

        Regex rgx = new Regex(pattern);
        string[] groupNames = rgx.GetGroupNames();

        for (int i = 0; i < groupNames.Length; i++)
        {
            Console.WriteLine(groupNames[i]);
        }
    }
}

其結果為